Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d803cbc4dd0b58e…

MALICIOUS

PDF

39.5 KB Created: 2020-08-01 12:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 595d99bdaff07781368726f0a7b28fb9 SHA-1: e7a8345cd3968f1b872cafb587cfafeb6e6c0179 SHA-256: 6d803cbc4dd0b58e6909b34af7c6d64a8b205c8c7677b4f99a506efdbad424a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=serena+bloodfeather+vanilla, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of the malicious redirector and link farm strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=serena+bloodfeather+vanilla
    • http://files.infieldrakes.com/uploads/1/3/0/7/130775897/02b962d4858a.pdf
    • http://files.bridaltraditionsnc.com/uploads/1/3/1/1/131164236/jotubuzosowa.pdf
    • http://files.beyondthegap.org/uploads/1/3/1/0/131070362/fejudala-dopapepesaxekov-denubuz.pdf
    • http://files.ice-fyre.ca/uploads/1/3/0/8/130874359/toxilepexafamut.pdf
    • http://files.ramsportsnetwork.com/uploads/1/3/1/3/131381021/zumorotanosunufob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/mufuvevedipejafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/xodiwopukosiwojafexutigaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/6026492331.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/zikex.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/29009178402.pdf
    • https://cdn.shopify.com/s/files/1/0428/7083/3319/files/42092757126.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/nidajowegupawotadonavutu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/universal_serial_bus_controllers_driver_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7108/files/64625636589.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005783.bin
697150d24fa57067d2850007a0ba70d392ff3230cdcb0bb94938efadf3d9b8a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5783 5120 bytes
font_01_sfnt_off000068ea.bin
a8fc3b63afe153fb61074f41a5dbf8667f9cf76bb0518ec959434c4de1d3f05e
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EA 12728 bytes